Here's a detailed overview of 25CrMo4, 34CrMo4, and 42CrMo4 high strength low alloy steel plates, focusing on their composition, properties, applications, and technical specifications:

1. Grading and Chemical Composition

These grades belong to European EN 10083-3 standard for quenched and tempered alloy steels. The naming convention indicates:

 

Numbers (25/34/42): Approximate carbon content (0.25%, 0.34%, 0.42%).

CrMo4: ~1% chromium (Cr) and ~0.25% molybdenum (Mo) as key alloying elements.

 

Grade	C	Si	Mn	Cr	Mo	P/S (max)	Key Characteristics
25CrMo4	0.22-0.29	0.15-0.40	0.60-0.90	0.90-1.20	0.15-0.30	0.025	Low carbon, high toughness and weldability
34CrMo4	0.30-0.37	0.15-0.40	0.60-0.90	0.90-1.20	0.15-0.30	0.025	Balanced strength and wear resistance
42CrMo4	0.38-0.45	0.15-0.40	0.60-0.90	0.90-1.20	0.15-0.30	0.025	High strength, ideal for heavy-duty applications

 

Key Alloy Roles:

 

Cr: Improves hardness, corrosion resistance, and hardenability.

Mo: Enhances high-temperature strength, prevents temper brittleness, and boosts wear resistance.

Medium-High Carbon: Increases tensile strength and hardness (especially in 34/42CrMo4).

 

 

 

Typical Applications

(1) 25CrMo4

Low-to-Medium Load Applications:

Welded Structures: Pressure vessels, pipelines, and boiler components (due to good weldability).

Automotive: Transmission shafts, gears, and steering knuckles in medium-duty vehicles.

Renewable Energy: Wind turbine hub connections requiring high toughness.

(2) 34CrMo4

Medium-to-Heavy Load Applications:

Industrial Machinery: Gears, crankshafts, and spindles in milling machines or presses.

Oil & Gas: Drill collars, pump shafts, and high-pressure valves.

Aerospace: Landing gear components and structural brackets.

(3) 42CrMo4

Heavy-Duty and High-Stress Applications:

Power Generation: Turbine shafts, generator rotors, and steam engine components (high-temperature resistance).

Construction Equipment: Excavator arm pins, crane hooks, and heavy-duty gears.

Military: Tank tracks, artillery barrels, and armored vehicle components.

 

 

 

 

 

 

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